On Geodynamic Evolution of Simao Region (Southwestern Yunnan, China) during Late Paleozoic and Triassic

摘要

Over the last years, the Simao region, southwestern Yunnan, China, turned out to be a very promising target to elucidate plate-tectonic processes around the Permian-Triassic boundary within the Tethyan domain of Asia. New data from this area reveal that Upper Paleozoic compressional deforma- Tions occurred along the Lancangjiang and in areas to the east. Along Lancangjiang, an angular uncon- Formity is exposed, which separates quartz-phyllites-formed during a Carboniferous tectono-metamor- Phic event-from triassic red beds to roofing rhyolites.